Fransiy
87
Fr
Guruh
1
Davr
7
Block
s
Protonlar
Elektronlar
Neytronlar
87
87
136
General Properties
Atom raqami
87
Atom massasi
[223]
Mass Number
223
Turkum
Ishqoriy metallar
Ranggi
Silver
Radioaktivlik
Ha
Francium was named after France
Crystal Structure
Nomaʼlum
Tarix
Francium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France.
It was discovered when she was researching the radioactive decay of actinium-227.
Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle.
It was discovered when she was researching the radioactive decay of actinium-227.
Marguerite Perey discovered that francium-223 is made naturally when actinium-227 emits an alpha-particle.
Electrons per shell
2, 8, 18, 32, 18, 8, 1
Elektron konfiguratsiyasi
[Rn] 7s1
Francium was the last element discovered in nature, rather than by synthesis
Physical Properties
Phase
Qattiq modda
Zichlik
1,87 g/cm3
Erish harorati
296,15 K | 23 °C | 73,4 °F
Qaynash harorati
950,15 K | 677 °C | 1250,6 °F
Heat of Fusion
2 kJ/mol
Heat of Vaporization
65 kJ/mol
Solishtirma issiqlik sigʻimi
-
Abundance in Earth's crust
Nomaʼlum
Abundance in Universe
Nomaʼlum
CAS Number
7440-73-5
PubChem CID Number
Nomaʼlum
Atomic Properties
Atom radiusi
260 pm
Kovalentlik radiusi
348 pm
Elektrmanfiylik
0,7 (Poling boʻyicha)
Ionization Potential
4,0727 eV
Molyar hajm
71,07 cm3/mol
Issiqlik oʻtkazuvchanlik
0,15 W/cm·K
Oksidlanish darajasi
1
Applications
Due to its instability and rarity, there are no commercial applications for francium.
It has been used for research purposes in the fields of biology and of atomic structure.
Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.
It has been used for research purposes in the fields of biology and of atomic structure.
Its use as a potential diagnostic aid for various cancers has also been explored, but this application has been deemed impractical.
Francium is highly radioactive
Izotoplar
Barqaror izotoplar
-Beqaror izotoplar
199Fr, 200Fr, 201Fr, 202Fr, 203Fr, 204Fr, 205Fr, 206Fr, 207Fr, 208Fr, 209Fr, 210Fr, 211Fr, 212Fr, 213Fr, 214Fr, 215Fr, 216Fr, 217Fr, 218Fr, 219Fr, 220Fr, 221Fr, 222Fr, 223Fr, 224Fr, 225Fr, 226Fr, 227Fr, 228Fr, 229Fr, 230Fr, 231Fr, 232Fr